fix: catch exceptions when clearing addon store download directory on init

[seang1121]

Fixes #19202

Summary

When the _dl (addon store download) directory exists but has broken permissions (e.g. caused by a cloud backup tool like Google Drive locking the folder), shutil.rmtree raises a PermissionError that propagates uncaught through module initialisation. Because this happens at import time, NVDA crashes immediately with a CRITICAL - core failure, then the watchdog restarts it — creating a crash loop with no recovery path.

The fix wraps the rmtree + mkdir block in a try/except that logs the error with log.exception and continues. The add-on store may not be fully functional without a clean download directory, but NVDA itself will start successfully and the user can investigate.

Changes

• source/addonStore/network.py: wrap the download directory cleanup and creation in a try/except inside AddonFileDownloader.__init__

Test plan

• Simulate a permission error on the _dl directory (%appdata%\nvda\addonStore\_dl) and confirm NVDA starts without crashing
• Confirm the error is logged via log.exception in the NVDA log
• Confirm normal add-on store behaviour is unaffected when permissions are fine

[seanbudd]

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